Display Apparatus Voltage Feedback for Flexible Flat Cable Fault Detection
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Solution Overview
Problem
Existing display apparatuses face challenges in determining the connection status of flexible flat cables and managing heat generation issues associated with these connections, which can lead to performance degradation and reduced lifespan.
Innovation Solution
The display apparatus includes a configuration where the first driving voltage line is connected to the second driving voltage line through a flexible flat cable, and a feedback driving voltage line is connected to a driving voltage sensing circuit, allowing for the detection of electrical disconnections and preventing heat generation failures by reducing sensing voltage when a connection failure occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible flat cable is used to connect the source printed circuit board and control printed circuit board, then the display apparatus can achieve flexible electrical connection, but the connection status cannot be determined and heat generation issues occur
Solution Approach 1:
The patent introduces a feedback mechanism by connecting a feedback voltage line from the source printed circuit board to the control printed circuit board through the flexible flat cable. The control printed circuit board senses the voltage level on this feedback line to determine whether the flexible flat cable is properly connected, thereby enabling connection status detection without compromising the flexible connection capability.
2Adaptability or versatility
If the flexible flat cable connects the source printed circuit board and control printed circuit board, then electrical connection is achieved, but poor heat generation occurs leading to reduced lifespan
Solution Approach 1:
The patent implements preliminary action by establishing the feedback voltage line connection before the display apparatus operates. The control printed circuit board continuously monitors the feedback voltage to detect connection issues in advance, allowing preventive measures to be taken before heat generation problems arise, thereby extending the lifespan of the flexible flat cable and display apparatus.
Solution Approach 2:
The feedback voltage line provides continuous monitoring of the flexible flat cable connection status. When connection issues are detected through voltage sensing, the system can respond appropriately to prevent heat generation failures, thereby protecting the lifespan of the electrical connection components.
3Power
If the first driving voltage line is connected to the second driving voltage line through the flexible flat cable, then power delivery is achieved, but connection failures go undetected
Solution Approach 1:
The patent uses the feedback voltage line as a monitoring channel that runs parallel to the power delivery path. The control printed circuit board senses the voltage on the feedback line to detect connection failures in the flexible flat cable, while the first and second driving voltage lines continue to deliver power normally. This feedback mechanism enables connection failure detection without interfering with power delivery functionality.
Data Source
AI summary
A display apparatus includes: a display panel including a plurality of subpixels; a control printed circuit board including a first driving voltage line, a power management circuit, and at least one first feedback driving voltage line electrically connected to the power management circuit; a source printed circuit board electrically connected between the display panel and the control printed circuit board, the source printed circuit board including at least one second driving voltage line electrically connected to at least one of the subpixels; and at least one flexible flat cable connected between the source printed circuit board and the control printed circuit board. The first driving voltage line may be electrically connected to the at least one second driving voltage line through the at least one flexible flat cable, and the at least one first feedback driving voltage line may be electrically connected to the at least one flexible flat cable.